US2755474A - Fastener applying device - Google Patents

Description

July 24, 1956 H. J. SPENCER 2,

FASTENER APPLYING DEVICE Filed March 15, 1954 5 Sheets-Sheet 1 IN VEN TOR.

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July 24, 1956 H. J. SPENCER FASTENER APPLYING mzvxo's S Sheets-Sheet 2 Filed March 15, 1954 IIZgENTOR.

y 1956 H. J. SPENCER 2,755,474

FASTENER APPLYING DEVICE Filed March 15, 1954 3 Sheets-Sheet 3 INVENTOR zp ew FASTENER APPLYING DEVICE Herman J. Spencer, Ingomar, Pa.

Application March 15, 1954, Serial No. 416,213

Claims. (Cl. 1-49) The present invention relates to fastener applying implements and more particularly to plier type implements adapted to be held and operated in one hand.

One object of the present invention is to provide an implement of the type indicated having a magazine through which fasteners may be supplied which has fastener applying arms positioned in relation to the magazine so as to leave the upper side of the latter accessible and a pivoted hand lever having a central portion overlying and movable towards the upper part of the magazine for urging the actuating arms to drive a fastener.

Another object is to provide means between the hand lever and the actuating arms whereby the hand lever can be pivoted in reverse fastener applying direction away from the upper side of the magazine to give access to the latter.

Another object is to provide an implement of the type indicated with a hand lever which is pivoted on the anvil member, overlies the magazine and has a shiftable contact with an irregular shaped cam on the driver actuating levers to provide extreme relative movement between the anvil member and the magazine without reducing the effectiveness of the hand lever to powerfully urge the actuating levers to drive long legged fasteners.

Another object is to provide an implement of the type indicating with actuating arms pivoted or otherwise mounted on the magazine frame member to thereby transmit a part of pressure applied on the actuating arms to the magazine frame member to urge the latter to grip one side of material and a pivoted hand lever having an operable connection with the actuating arms for urging the latter in fastener applying direction.

Another object is to provide a novel means for holding the driving blade in operable contact with a driver head plate which is connected to the actuating arms.

Still another object is to provide means which prevents the driver from being retracted in relation to the magazine until a fastener has been completely ejected from the device.

Another object is to provide means at the loading end of the magazine for releasably holding the pusher and for pivoting the latter to an inverted position to permit fasteners to be loaded into the device above the fastener pusher.

Further objects of the invention are set forth in the following specification which describes a preferred form of the implement as illustrated by the accompanying drawings. In the drawings Figure 1 is a side elevational view of a fastener applying implement showing the features of the present invention and showing the manually operated hand lever pivotally mounted on the anvil arm with its roller engaging the cam surfaces on the actuating arms;

Figure 2 is a longitudinal sectional view of the implement showing the spring for normally holding the actuating arms and anvil member in spaced relation to the magazine frame member with pressure on the hand atent lever as having thereby moved the devices parts a slight amount in fastener applying direction;

Figure 3 is a view similar to Figure 1 showing the actuating arms and anvil arm as actuated in relation to the magazine by the manually operated hand lever to thereby drive and clinch a fastener while rigid pressure is being applied to the anvil arm and the magazine to urge the latter arm and magazine to grip the material. Also shown is the blade retainer as having been shifted longitudinally to thereby shift a portion of the full throw mechanism spring out of the slot in the head portion of the magazine;

Figure 4 is a plan view taken along line lV- IV of Figure 1 to show the relation of the parts with each other;

Figure 5 is a transverse vertical section taken along line V-V of Figure 1;

Figure 6 is a plan view taken along line VI-.-VI of Figure 1 to illustrate the relative positions of the full throw mechanism parts in the position shown in Figure 1;

Figure 7 is a plan view taken along line VII-VII of Figure 2 to illustrate the relative positions of the full throw mechanism parts in the position shown in Figure 2;

Figure 8 is a plan view taken along line VIII-VIII of Figure 3 to illustrate the relative positions of the full throw mechanism parts in the position shown in Figure 3;

Figure 9 is a view similar to Figure 1 but showing the hand lever as having been pivoted counter-clockwise in reverse fastener applying direction to a position which exposes the upper side of the magazine. The loading or rear end of the device is shown in section to illustrate the pusher as having been moved thereto and in its horizontal feeding position;

Figure 10 is a transverse vertical section taken along line XX of the loading end of Figure 9 to illustrate the a io ip be e n e Par Figure 11 is a side elevation of the loading end of the device with nearest sidewardly parts cut away to show the pusher as having been swung from its horizontal feeding position to an inverted position to permit fasteners to be fed into the loading end of the device above the pusher;

Figure 12 illustrates a group of parts which are to be connected together to form the assembled driver and the flat type spring which is controlled by one of the parts to keep the assembled driver from rising in relation to the magazine until a fastener has been completely driven from the device;

Figure 13 is an isometric view of the staple pusher.

Referring to the drawings, the magazine 1 is of channel shape in cross-section comprising a bottom wall 39 and parallel side walls 439 extending upwardly therefrom as shown in Figures 1 and 5. A U-shaped head 15 has a central portion 41 extending transversely and vertically for closing the front end of the magazine 1, the lower part of which acts as the front wall of the driving throat 8. The central portion 41 of head 15 has two vertical flanges 18 which extend longitudinally towards the rear end and vertically above the side walls 40 of the magazine 1, the flanges fitting within and secured to the front ends of the side walls 401 of the magazine 1. The lower inwardly sides 17 of flanges 18 of head 15 act as the sideward walls of the driving throat 8. See Figure 5. The vertical flanges 18 of head 15 have aligned vertically extending slots 14 with the vertical edge of one of flanges 18 having a cam edge 42 near its uppermost end which slants upwardly towards the rear end of the device and a distance downwardly therefrom has an upstanding hookshaped lug portion 44 extending towards the rear end of the device which has a second cam edge 43 on its lug portion 44 which also slants upwardly towards the Hold down brackets 45 are long right angle shapedin cross-section and they are welded to the inwardly sides of the side walls 40 of the magazine frame 1 with their short flanges extending towards each other and longitudinally substantially the full length of the device to overlie and restrict staple from moving upwardly. See Figures 2 and 5.

A staple guide 5 is U-shaped in cross-section having a bottom wall 46 and upstanding parallel side walls 47 upon which U-shaped staples S may be straddled to be fed therealong towards the front end of staple guide 5 to the driving throat 8 for delivery to the applying means. The side walls 47 are pierced adjacent their front ends to receive the transversely positioned pin 48 and the feeder spring pulley 49 is mounted on pin 48 between the side walls 47 of the staple guide 5. See Figure 2.

The side walls 47 of the staple guide 5 extend a short distance beyond the rear end of its bottom wall 46 to form guides 50 which have been evenly pressed towards each other a slight amount and have aligned longitudinally extending slots 51 therein which are open towards the front end of the staple guide 5 and are closed at their rearwardly positioned depending hook-shaped ends 52.

The staple pusher 7 is of channel shape in cross-section having a central web 53 and depending flanges 54 and is adapted to straddle the side walls 47 for moving staples S along and towards the front end of the staple guide 5. A finger grip 55 has a web section 56 which has spaced apart parallel depending flanges 57 which are in parallel alignment with and spaced apart from the inwardly sides of the depending flanges 54 of the staple pusher 7. See Figures and 13. Flanges 57 have aligned pierced holes 58 adapted to receive the enlarged central portion of pin 59 to position the latter transversely in the device. The upper side of the web 56 of the finger grip 55 is welded or otherwise secured to the under side of the central web 53 of the pusher 7 as shown in Figure 13 and it has a tab 60 formed upwardly to act as a finger grip for retracting the pusher 7 when loading of the device is required. It will be noticed in Figure 10 that the ends 61 are of less diameter than the central portion of pin 59 and that ends 61 are adapted thereby to move along the length of slots 51 and further that the larger central portion of pin 59 prevents the latter from moving transversely in relation to the guide 50 when ends 61 are in slots 51. It will also be noticed in Figure 10 that the pin 59 is only slightly less in length than the space between the side walls 47 of the staple guide 5 and pin 59 can therefore move longitudinally but is restricted from moving transversely in relation to the staple guide 5.

The feeder spring 6 has one end 62 held on lug 63, the latter being formed upwardly from the bottom wall 46 of the staple guide 5 adjacent to the latters rear end, and spring 6 is brought upwardly around pulley 49 with its other end 64 being brought back to overlie its lower strand. The feeder spring end 64 is placed between the depending flanges 57 which are attached to the pusher 7 and pin 59 while passing through a coil of spring end 64 of the feeder spring 6 is entered into holes 58 of flanges 57 with ends 61 of pin 59 protruding transversely outwardly from the outwardly sides of flanges 57. The pusher 7 is held vertically at right angle to its horizontal feeding position on the staple guide 5, the pin 59 while extending transversely is lowered to a position between the side walls 47 and then moved towards the rear end of the staple guide 5 to thereby move the ends 61 of pin 59 into and along slots 51 to the depending hook-shaped ends 52 of slots 51 with pin 59 being held thereby from moving towards the driving throat 8 end of the device. See Figure 11. With pin 59 held in the hook-shaped ends 52 of slots 51, the pusher 7 is pivoted clockwise on pin 59 to the upsidedown position shown in Figure 11 and in the latter position, a strip of staples the legs of which can be the same as the heighth of the guide bar 5 can be fed onto it above the pusher 7. After the staples are loaded, the pusher 7 is then rotated counterclockwise on pin 59 to its horizontal feeding position on the staple guide 5 behind the strip of staples S with pin 59 being moved upwardly out of the hook-shaped ends 52 to the longitudinally extending portions of slots 51 to thereby permit the feeder spring 6 to pull the pusher 7 to thereby feed the staples towards the driving throat 8.

The assembled driver 32 is comprised of the following parts. The driving blade 9 is made from flat sheet metal with its thickness corresponding to the wire gage of the staples being used. A centrally located lug 2!) extends upwardly from the body portion of the driver blades 9 uppermost end and a short distance downwardly from its lug 20 is a small rectangular shaped hole 65 punched centrally in its body portion. See Figures 2 and 12. A lower rectangular shaped flat plate 10 has a centrally located hole 19 close by its one end which is adapted to receive lug 20 of the driving blade 9 to position the latters ing 20 end vertically above the driving threat 8 and centrally in the device, and plate 10 has lugs 12 which project transversely outwardly a short distance from its body portion in line with its hole 19. A centrally located lug 66 extends longitudinally towards the rear end of the device from the body portion of plate 10. See Figure 12. An upper plate 11 compares substantially in shape to the lower plate 10 and it lies horizontally flatwise on top of plate 10 with its transversely extending lugs 13 and its longitudinally extending lug 67 in alignment with lugs 12 and lug 66 of plate 10. See Figures 2, 5 and 6. Lugs 12 and 13 of plates 10 and 11 respectively extend outwardly transversely through and a short distance outwardly beyond slots 14 of head 15 and plates 10 and 11 are thereby restrained from moving longitudinally relative to each other during vertical movement. The sidewardly edges of the body portions of plates 10 and 11 move closely along the inwardly sides 17 of flanges 18 of head 15 to prevent sideward movement of plates 10 and 11 during their vertical movement in relation to head 15. See Figures 5 and 6. A flange 68 is formed upwardly from the one end of the body portion of the upper plate 11 and flange 68 has a small rectangular hole 70 pierced centrally therein. The upper plate 11 has two small bosses 69 spaced apart and projecting above its uppermost flat surface for reasons to be explained. See Figures 6 and 12. A spring 71 is made from light gage flat metal spring stock and it has two holes 72 punched in its body which are adapted to fit over the two bosses 69 of the upper plate 11 and lie flatwise against the latter with bosses 69 restraining the body portion of the spring 71 from moving about horizontally in relation to the upper plate 11. Spring 71 has an arm 73 standing upright at right angle to its horizontally lying body portion which extends close by and longitudinally along the inwardly side 17 of one of the flanges 18 of the head 15. Arm 73 of spring 71 is integrally joined to its body portion starting at its rear end by a short longitudinal section along its sidewardly edge thereby leaving the greater part of the length of arm 73 free to flex'transversely of the device. See Figures 6, 7 and 12. A short section of the free end of arm 73 is formed transversely outwardly at 74 to thereby protrude into one of the slots 14 of head 15. The lower edge of section 74 is formed transversely towards the center of the device a short distance in line with the horizontally lying body portion of spring 71 and then upwardly to form lug 75 with the latter being spaced apart from and parallel to arm 73. See Figures 6 and 12. A U-shaped blade retainer 76 is made from flat sheet metal and is adapted to have its lower leg 77 fit flatwise snugly against the under side of lower plate 10 with its upper leg 78 lying flatwise snugly against the upper side of the body portion of spring 71 to hold it flatwise against the uppermost side of the upper plate 11 and into engagement with bosses 69. The sidewardly wall 79 of the blade retainer 76 integrally joins legs 77 and 78 and it extends flatwise transversely a short distance away from the edges or" the rear ends of the body portions of plates and 11. A hole 33 is pierced centrally in the transversely extending sidewardly wall 79 of the blade retainer 76 and hole 89 is adapted to fit over lugs 66 and 67 of the plates 10 and 11 to guide the rear end of the blade retainer 76 during its longitudinal movement. See Figures 5 and 12. A small centrally located lug 81 projects longitudinally from the one end of leg 77 of the blade retainer 76 and lug 81 extends through and beyond and. is movable in hole 65 of the driving blade 9 to hold it upwardly against the under side of the lower plate 11). A rounded bump section 32 is formed upwardly at the end of lug 81 to restrain it from freely moving longitudinally out of hole 65. See Figures 2 and 12. A small centrally located lug 83 projects longitudinally from the front end of the upper leg 78 of the blade retainer 76 and lug 83 extends freely through and beyond hole 79 in flange 63 of the upper plate 11 to guide the front end of the blade retainer 76 during its longitudinal movement. See Figures 2 and, 12. A longitudinally extending notch 84 which is open at the front end or" the upper leg 73 provides a flat arm 35 which lies horizontally in line with the flat body portion of the upper leg 75% of the blade retainer 76 and arm 35 extends longitudinally towards the front end of the latter. Extending from its end longitudinally along the inwardly edge of arm 85 of the blade retainer 76 is a short section 86 which terminates in a cam edge 87 which extends a very short distance at an an le towards the center of the device to a very short longitudinally extending section 33. See Figure 12.

A lug J extends transversely outwardly from one end of the sidewardiy wall 73 of the blade retainer 76 and lug 39 is in vertical alignment with cam edges 42 and 43 on one of the flanges 18 of head 15. The blade retainer 76 is thereby adapted to be shifted longitudinally back and forth a short distance when it is moved vertically in relation to head and its lug 39 contacts cam edges 42 and 43 of the head 15. See Figures 1, 3, 6, 8 and 12. The parts listed above will hereafter be referred to as the assembled driver 32.

As shown in Figure 7, the short section 86 of arm 85 of the blade retainer 76 lies between the outwardly formed portion 74 and lug 75 of spring 71 with section 86 in contact with and longitudinally in line with the outwardly vertical side of lug 75 and further that there is a space between the outwardly longitudinally extending edge of arm of the blade retainer 76 and arm 73 of spring 71 to allow the free end of arm 73 to move transversely towards the center of the device.

in the starting position shown in Figures 1, 5 and 6, a staple S has been fed into position beneath the assembled driver 32, the outwardly side of the outwardly formed portion 74 of spring 71 is resting against the inwardly side 17 of flange 13 at a point directly above the uppermost end of one of the slots 14 of head 15.

By means to be described later, the assembled driver 32 is moved downwardly a short distance in relation to the magazine 1 to thereby partially eject or drive the staple S and in this lowered position the outwardly formed portion 74 of spring 71 is moved transversely outwardly into slot 14 of head 15 by the flexing action of its arm 73. See Figures 2 and 7.

The driving blade 9 of the assembled driver 32 having been lowered a short amount will thereby block additional staples from being fed into the driving throat 8 and the uppermost edge of the outwardly formed portion 74 of spring 71 is below and in vertical alignment with the uppermost end of slot 14 of head 15 to thereby obstruct the assembled driver 32 from moving to its start ing position, upwardly in relation to head 15 of the magazine 1.

As explained above, the assembled driver 32 cannot be retracted but can and is moved downwardly in relation tojthe head, 15 of the magazine 1 to completely drive the staple S with the full throw mechanism operating as follows: As the assembled driver 32 nears the end of its vertically downward staple driving movement in relation to head 15 of the magazine 1, lug $9 of the blade retainer 76 rubs along the lower cam edge 43 of the head 15 to thereby shift the blade retainer 76 longitudinally towards the front end of the device with cam edge 87 of the blade re tainer 76 contacting lug on arm 73 of the spring 71 to thereby move lug 75 to rest against section 88 of the blade retainer 76 with outwardly formed portion 74 of spring 7.1 also being moved transversely inwardly and thereby out of vertical alignment with the uppermost end of slot 1dof head 15 to thereby permit the assembled driver 32 to be moved upwardly in relation to the magazine 1 toits starting position to permit another staple to be fed into driving position beneath the driving blade 9. See Figures 3 and 8.

During upward movement of the assembled driver 32, in relation to the magazine 1, the uppermost edge of the outwardly formed portion 74 of spring '71 moves past the uppermost end of one of the slots 14 in head 15 and the lug 89 of the blade retainer 76 rubs against the cam edge i2 of the head 15 to thereby move the blade retainer 76 longitudinally towards the rear end of the device to thereby position section 86 of the blade retainer 76 transversely in line with and spaced apart from lug 75 of spring 71 with the latters portion '74 thereby being flexibly moved transversely outwardly a slight amount to its starting position against the inwardly side 17 of flange 13.

An anvil arm 2 has the usual clincher means 21 fixed at its free end to underlie the driving channel 8 at the free end of the magazine 1. The rearwardly ends of the anvil arm 2 and the magazine 1 are pivoted together to thereby permit movement of their free ends towards each other to grip material M. The anvil arm 2 is of channel shape having a bottom wall 22 which underlies the magazine 1 to act as part of a hand-grip. The bottom wall 22 of the anvil arm 2 has upstanding longitudinally extending side walls 23 which are suitably spaced apart to adapt them to move close by the vertical outwardly sides of the magazine 1. The side walls 23 of the anvil arm 2 are pierced to receive pin 24 and the anvil arm 2 is thereby pivoted to the magazine frame 1. A short distance from pin 24 and extending towards the front end of the stapler, a portion of the side walls 23 of the anvil arm 2 are spaced a greater distance apart to provide narrow transversely confining slots on both sides of the device which extend vertically longitudinally between the outwardly sides of the vertical flanges 41 of the magazine 1 and the inwardly vertical sides of flanges 23 of the anvil arm 2 to provide a working space for the flat metal actuating arms 3. The flanges 23 of the anvil arm 2 are notched centrally at their front ends to receive material and to form arms 25 which extend upwardly on both sides of the device.

Twin flat metal actuating arms 3 fit flatwise and extend longitudinally in the narrow slots mentioned above, one on each side of the device with their centrally located cam edges 30 uppermost and in contact with roller 29 of the hand lever 4. See Figure 1. The actuating arms 3 are pivoted at their rear ends on headless rivets 31 which protrude transversely outwardly the thickness of arms 3 from the vertical side walls 46 of the magazine l and actuating arms 3 are operably connected at their front ends to the driver assembly 32 for reciprocating the latter. The elongated longitudinally extending slots 9% at the front ends of actuating arms 3 fit over the transversely extending ends of lugs 12 and 13 of plates 1 and 11 respectively of the assembled driver 32 to reciprocate the latter. See Figures 1, 3 and 5.

A hand lever 4 is of inverted U shape having a central portion 33, used as the balance of a hand-grip, which overlies and is movable towards the upper side of the magazine 1. The central portion 33 of the hand lever 4 has depending side flanges 26 which at their front ends straddle the upwardly extending arms 25 of the anvil arm 2. See Figure 4. At their front ends the side filanges 26 of the hand lever 4 are pivotally connected to the front ends of arms 25 of the anvil arm 2 by rivets 27 and flanges 26 are pierced intermediate their ends a short distance from rivets 27 to receive pin 28. A cam roller 29 is mounted on pin 28 and extends transversely to the inwardly sides of flanges 26 of the hand lever 4. See Figures 2 and 4.

It will be noted in Figures 2 and 5, a transversely extending pin 33 whose ends are entered in aligned holes in the actuating arms 3 and that these holes are located between the latters slots 99 and their cam edges 30.

As shown in Figure 2 the retraction spring 34 is pulling the front ends of the actuating arms 3 through pin 33 in an angled upwardly direction and pulling the hand lever 4 through the latters lug 35 in substantially the opposite direction to thereby hold the cam edges 30 of the actuating arms 3 in constant contact with roller 29 of the hand lever 4 and thereby roller 29 is used as a leverage point to thereby force the rear ends of the actuating arms 3 in a downwardly direction while urging the hand lever 4 to pivot counterclockwise on rivets 27. As the hand lever 4 and the actuating arms 3 are moved in the direction indicated above by the pull of the refraction spring 34, the hand lever 4 pivots counterclockwise on rivets 27 and roller 22 is thereby moved upwardly in an arc around rivets 27 with the rear ends of the actuating arms 3 through the headless rivets 31 acting to hold the magazine frame 1 against the anvil arm 2 while the front ends of actuating arms 3 move the driver assembly 32 upwardly in relation to the magazine frame 1 to the limit of slots 14 of the head 15. Continued pull by the retraction spring 34 after the driver assembly 32 is stopped, as explained above, will move the magazine frame 1 and the actuating arms 3 upwardly in one direction and the anvil arm 2 downwardly in an opposite direction through the hand lever 4 and rivets 27 to thereby separate the driving channel 8 from the clincher 21 to the position shown in Figure 1. In the latter position, it will be noted that roller 29 of the hand lever 4 has been settled into the curved notch 37 of the actuating arms 3 and is held in this position by the pull of the retraction spring 34. As shown in Figure 9, the hand lever 4 has been manually moved counterclockwise on rivets 27 to a vertically extending position that thereby exposes the upper side of the magazine frame 1 and that roller 29 has been settled into the retainer notch 36 of the actuating arms 3 and is held in this latter position by the pull of the retraction spring 34.

In Figure 1, the starting position, the: driver assembly 32 is raised in relation to the magazine frame 1, thus permitting a staple S to be fed into the driving throat beneath the driving blade 9, the roller 29 of the hand lever 4 is seated in notch 37 of the actuating arms 3 and the front ends of the magazine 1 and the anvil arm 2 are spaced apart to receive material M to be stapled. Manual pressure is exerted on hand lever 4 and the anvil arm 2 with the following results: the roller 29 of the hand lever 4 exerts pressure against the sharply inclined ends 91 of cam edges 30 of the actuating arms 3 to thereby transmit the applied pressure along a line extending through the headless rivets 31 of the magazine frame 1 and further to pass horizontally below but close by pin 24 with the pressure thus exerted moving the front end of magazine frame 1 towards the front end of the anvil arm 2 to grip the material M therebetween with roller 29 of the hand lever 4 moving upwardly on the sharply inclined ends 91 of cam edges 30 of the actuating arms 3. During the operation so far, it will be observed from Figures 1 and 2 that the hand lever 4 has pivoted in fastener applying direction clockwise on rivets 27 of the anvil arm 2 a very slight amount while the front ends of the magazine 1 and the anvil arm 2 were moved a considerable distance towards each other. When the free or front ends of the magazine 1 and the anvil arm 2 are stopped by contact with material M as shown in Figures 2 and 3 and further pressure is applied to the device, the roller 29 of the hand lever 4 is thereby moved in a downwardly arc clockwise around rivets 27 and longitudinally along cam edges 34) of the actuating arms 3 to thereby progressively shift the extended direction of the applied force away from pin 24 and towards a position between the headless rivets 31 of the magazine 1 and rivets 27 of the anvil arm 2. See Figures 1, 2 and 3. The roller 29 of the hand lever 4 thus exerts pressure in fastener applying direction on the actuating arms 3 at a point intermediate its ends to force the slots to move the assemled driver 32 downwardly to drive a staple from the magazine to clinch it against the anvil while the rear ends of arms 3 through headless rivets 31 forces the front end of the magazine against the upper side of the material M with lever 4, through rivets 27 acting to force the front end of anvil arm 2 upwardly to grip the underside of the material. See Figure 3.

I claim:

1. In a device of the type indicated, a magazine for holding a supply of fasteners and having a throat at one end through which the fasteners are driven, an actuating arm and a driver carried by said actuating arm for reciprocating said driver in said throat, said actuating arm arranged to permit access to substantially the full length of the upper side of said magazine, an anvil arm underlying said magazine for gripping one side of material and clinching the legs of fasteners, means for pivotally connecting the magazine and arms for relative movement, a hand lever overlying and movable towards and away from the upper side of said magazine, means pivotally connecting said hand lever to said anvil arm for moving the latter relative to said magazine, operable connector means between said hand lever and said actuating arm for moving the latter in fastener applying direction when said hand lever is moved towards the upper side of said magazine, said operable connector means permitting said hand lever to move in one direction towards the upper side of said magazine to thereby move said arms relative to the magazine to drive and clinch a fastener and to move in an opposite direction away from overlying the upper side of said magazine to thereby give access to the latter.

2. A device as claim 1 further characterized by said operable connector means constituting an inclined angle cam surface on said actuating arm and means on said hand lever movable along said inclined cam surface to thereby accentuate the movement of said arm during the initial movement of said hand lever towards the upper side of said magazine.

3. A device as in claim 2 further characterized by said pivot of said actuating arm being on said magazine at a point intermediate its ends to thereby transmit a part of pressure applied on said actuating arm by said hand lever to said magazine to urge the latter to grip one side of the material.

4. A device as claim 1 further characterized by resilient means acting to maintain contact of said operable connection when said hand lever is in position to give access to said magazine.

5. In a device of the type indicated, a magazine for holding a supply of fasteners and having a throat at one end through which the fasteners are driven, an actuating arm and a driver carried by said actuating arm for reciprocating said driver in said throat, an anvil arm underlying said magazine for clinching the legs of fasteners and gripping one side of material, means for pivotally connecting the magazine and the arms for relative movement, a hand lever overlying and movable towards and away from the upper side of said magazine, means pivotally connecting said hand lever to said anvil arm for moving the latter towards said magazine, operable connector means between said hand lever and said actuating arm for urging the latter to reciprocate said driver in said throat, means in said operable connector means adapted at the beginning of a fastener applying operation to direct manual power applied on said hand lever to said actuating arm in a direction towards the pivot of the actuating arm and continuing in the same direction towards the pivot of said magazine with said anvil arm to thereby resist pivotal movement of said hand lever in relation to said anvil arm, said means in said connector means permitting the point of contact on said hand lever to shift in relation to the point of contact on said actuating arm as said hand lever is moved in fastener applying direction towards the upper side of said magazine to thereby progressively shift the direction of said manual pressure away from its initial direction and progressively towards a point between the pivot of the magazine and the magazine driving throat to thereby greatly increase the leverage advantage of said 10 hand lever during movement of the latter in fastener applying direction.

References Cited in the file of this patent UNITED STATES PATENTS 2,218,934 Germain Oct. 22, 1940 2,267,719 Crosby Dec. 30, 1941 2,275,548 Olsen Mar. 10, 1942 2,354,760 Lindstrom Aug. 1, 1944 2,438,713 Maynard Mar. 30, 1948 2,580,505 Balma Jan. 1, 1952 2,625,681 Boroughs Jan. 20, 1953

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